php如何获取kb中的web图像大小?
getimagesize
只能获得宽度和高度。
和filesize
导致waring
。
$imgsize=filesize("http://static.adzerk.net/Advertisers/2564.jpg");
echo $imgsize;
Warning: filesize() [function.filesize]: stat failed for http://static.adzerk.net/Advertisers/2564.jpg
有没有其他方法可以获得kb的网页图片尺寸?
答案 0 :(得分:18)
没有完成一个完整的HTTP请求,没有简单的方法:
$img = get_headers("http://static.adzerk.net/Advertisers/2564.jpg", 1);
print $img["Content-Length"];
您可以使用cURL
来发送lighter HEAD
request instead。
答案 1 :(得分:5)
<?php
$file_size = filesize($_SERVER['DOCUMENT_ROOT']."/Advertisers/2564.jpg"); // Get file size in bytes
$file_size = $file_size / 1024; // Get file size in KB
echo $file_size; // Echo file size
?>
答案 2 :(得分:3)
这听起来像是权限问题,因为filesize()应该可以正常工作。
以下是一个例子:
php > echo filesize("./9832712.jpg");
1433719
确保在图像上正确设置权限,并且路径也正确。你需要应用一些数学来从字节转换为KB,但在这之后你应该处于良好状态!
答案 3 :(得分:2)
不确定将filesize()
用于远程文件,但是在php.net上有很好的片段,但是关于使用cURL。
答案 4 :(得分:1)
答案 5 :(得分:1)
您也可以使用此功能
<?php
$filesize=file_get_size($dir.'/'.$ff);
$filesize=$filesize/1024;// to convert in KB
echo $filesize;
function file_get_size($file) {
//open file
$fh = fopen($file, "r");
//declare some variables
$size = "0";
$char = "";
//set file pointer to 0; I'm a little bit paranoid, you can remove this
fseek($fh, 0, SEEK_SET);
//set multiplicator to zero
$count = 0;
while (true) {
//jump 1 MB forward in file
fseek($fh, 1048576, SEEK_CUR);
//check if we actually left the file
if (($char = fgetc($fh)) !== false) {
//if not, go on
$count ++;
} else {
//else jump back where we were before leaving and exit loop
fseek($fh, -1048576, SEEK_CUR);
break;
}
}
//we could make $count jumps, so the file is at least $count * 1.000001 MB large
//1048577 because we jump 1 MB and fgetc goes 1 B forward too
$size = bcmul("1048577", $count);
//now count the last few bytes; they're always less than 1048576 so it's quite fast
$fine = 0;
while(false !== ($char = fgetc($fh))) {
$fine ++;
}
//and add them
$size = bcadd($size, $fine);
fclose($fh);
return $size;
}
?>
答案 6 :(得分:0)
您可以使用get_headers()函数获取文件大小。使用以下代码:
$image = get_headers($url, 1);
$bytes = $image["Content-Length"];
$mb = $bytes/(1024 * 1024);
echo number_format($mb,2) . " MB";